Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a
During the Aptian Oceanic Anoxic Event 1a, about 120 million years ago, black shales were deposited in all the main ocean basins. The event was also associated with elevated sea surface temperatures and a calcification crisis in calcareous nannoplankton. These environmental changes have been attribu...
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Online Access: | https://hdl.handle.net/1983/a790084f-3a49-4503-bb94-3bc00a555bd6 https://research-information.bris.ac.uk/en/publications/a790084f-3a49-4503-bb94-3bc00a555bd6 https://doi.org/10.1038/ngeo2627 https://research-information.bris.ac.uk/ws/files/56644620/Manuscript_pCO2_NG_Naafs.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/a790084f-3a49-4503-bb94-3bc00a555bd6 2024-04-28T08:34:53+00:00 Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a Naafs, B D A Castro, Jose M de Gea, Ginés A. Quijano, Maria Luisa L Schmidt, Daniela N Pancost, Rich D 2016-02 application/pdf https://hdl.handle.net/1983/a790084f-3a49-4503-bb94-3bc00a555bd6 https://research-information.bris.ac.uk/en/publications/a790084f-3a49-4503-bb94-3bc00a555bd6 https://doi.org/10.1038/ngeo2627 https://research-information.bris.ac.uk/ws/files/56644620/Manuscript_pCO2_NG_Naafs.pdf eng eng https://research-information.bris.ac.uk/en/publications/a790084f-3a49-4503-bb94-3bc00a555bd6 info:eu-repo/semantics/openAccess Naafs , B D A , Castro , J M , de Gea , G A , Quijano , M L L , Schmidt , D N & Pancost , R D 2016 , ' Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a ' , Nature Geoscience , vol. 9 , no. 2 , pp. 135-139 . https://doi.org/10.1038/ngeo2627 Biogeochemistry Palaeoceanocgraphy Palaeoclimate article 2016 ftubristolcris https://doi.org/10.1038/ngeo2627 2024-04-03T15:30:05Z During the Aptian Oceanic Anoxic Event 1a, about 120 million years ago, black shales were deposited in all the main ocean basins. The event was also associated with elevated sea surface temperatures and a calcification crisis in calcareous nannoplankton. These environmental changes have been attributed to variations in atmospheric CO 2 concentrations, but the evolution of the carbon cycle during this event is poorly constrained. Here we present records of atmospheric CO 2 concentrations across Oceanic Anoxic Event 1a derived from bulk and compound-specific δ 13 C from marine rock outcrops in southern Spain and Tunisia. We find that CO 2 concentrations doubled in two steps during the oceanic anoxic event and remained above background values for approximately 1.5–2 million years before declining. The rise of CO 2 concentrations occurred over several tens to hundreds of thousand years, and thus was unlikely to have resulted in any prolonged surface ocean acidification, suggesting that CO 2 emissions were not the primary cause of the nannoplankton calcification crisis. We find that the period of elevated CO 2 concentrations coincides with a shift in the oceanic osmium-isotope inventory associated with emplacement of the Ontong Java Plateau flood basalts, and conclude that sustained volcanic outgassing was the primary source of carbon dioxide during Oceanic Anoxic Event 1a. Article in Journal/Newspaper Ocean acidification University of Bristol: Bristol Research Nature Geoscience 9 2 135 139 |
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Open Polar |
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University of Bristol: Bristol Research |
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ftubristolcris |
language |
English |
topic |
Biogeochemistry Palaeoceanocgraphy Palaeoclimate |
spellingShingle |
Biogeochemistry Palaeoceanocgraphy Palaeoclimate Naafs, B D A Castro, Jose M de Gea, Ginés A. Quijano, Maria Luisa L Schmidt, Daniela N Pancost, Rich D Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a |
topic_facet |
Biogeochemistry Palaeoceanocgraphy Palaeoclimate |
description |
During the Aptian Oceanic Anoxic Event 1a, about 120 million years ago, black shales were deposited in all the main ocean basins. The event was also associated with elevated sea surface temperatures and a calcification crisis in calcareous nannoplankton. These environmental changes have been attributed to variations in atmospheric CO 2 concentrations, but the evolution of the carbon cycle during this event is poorly constrained. Here we present records of atmospheric CO 2 concentrations across Oceanic Anoxic Event 1a derived from bulk and compound-specific δ 13 C from marine rock outcrops in southern Spain and Tunisia. We find that CO 2 concentrations doubled in two steps during the oceanic anoxic event and remained above background values for approximately 1.5–2 million years before declining. The rise of CO 2 concentrations occurred over several tens to hundreds of thousand years, and thus was unlikely to have resulted in any prolonged surface ocean acidification, suggesting that CO 2 emissions were not the primary cause of the nannoplankton calcification crisis. We find that the period of elevated CO 2 concentrations coincides with a shift in the oceanic osmium-isotope inventory associated with emplacement of the Ontong Java Plateau flood basalts, and conclude that sustained volcanic outgassing was the primary source of carbon dioxide during Oceanic Anoxic Event 1a. |
format |
Article in Journal/Newspaper |
author |
Naafs, B D A Castro, Jose M de Gea, Ginés A. Quijano, Maria Luisa L Schmidt, Daniela N Pancost, Rich D |
author_facet |
Naafs, B D A Castro, Jose M de Gea, Ginés A. Quijano, Maria Luisa L Schmidt, Daniela N Pancost, Rich D |
author_sort |
Naafs, B D A |
title |
Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a |
title_short |
Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a |
title_full |
Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a |
title_fullStr |
Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a |
title_full_unstemmed |
Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a |
title_sort |
gradual and sustained carbon dioxide release during aptian oceanic anoxic event 1a |
publishDate |
2016 |
url |
https://hdl.handle.net/1983/a790084f-3a49-4503-bb94-3bc00a555bd6 https://research-information.bris.ac.uk/en/publications/a790084f-3a49-4503-bb94-3bc00a555bd6 https://doi.org/10.1038/ngeo2627 https://research-information.bris.ac.uk/ws/files/56644620/Manuscript_pCO2_NG_Naafs.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Naafs , B D A , Castro , J M , de Gea , G A , Quijano , M L L , Schmidt , D N & Pancost , R D 2016 , ' Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a ' , Nature Geoscience , vol. 9 , no. 2 , pp. 135-139 . https://doi.org/10.1038/ngeo2627 |
op_relation |
https://research-information.bris.ac.uk/en/publications/a790084f-3a49-4503-bb94-3bc00a555bd6 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/ngeo2627 |
container_title |
Nature Geoscience |
container_volume |
9 |
container_issue |
2 |
container_start_page |
135 |
op_container_end_page |
139 |
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1797591412990017536 |